table {
    border-collapse: collapse;
    width: 70%;
}

th,
td {
    /* border: 1px solid #ddd; */
    border: 1px solid;
    /* 1px灰色细边框 */
    padding: 8px;
    text-align: center;
    font-size: 12px;
    text-align: left;
    padding-left: 15px;
    
}


th{
    font-size: 25px;
}



*{
    padding: 0;
    margin: 0;
}



body {
    height: 100vh;
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: 50px 1fr 50px;
  

}


.simplecenter{

    display: flex;
    justify-content: center;
    align-items: center;

}

